Pulley 1 rotates about fixed axis D and, through flexible link 3, rotates pulley 2 about fixed axis B. Pin a of flexible link 3 slides along slot b of slotted lever 4 which turns about fixed axis A. When pulley 1 rotates about axis D, link 4 oscillates about axis A. The law of motion of slotted link 4 per cycle can be changed by changing the positions of the axes of revolution of the pulleys.
$1863$FL,5L$